4.4 System Controls
System controls include a microprocessor control board mounted in the evaporator/chilled water unit and
a wall-mounted interface with a two-line, 16-character liquid crystal display. A seven-key, membrane
keypad for setpoint/program control, unit On/Off and alarm silence is below the LCD screen. It provides
temperature setpoint and sensitivity adjustment, humidity setpoint and sensitivity adjustment, digital
display of temperature, humidity, setpoints, sensitivities and alarm conditions.
The wall-box is field-wired to the microprocessor control using standard four-conductor thermostat wire
(field-supplied). The temperature and humidity sensors are in the wall box, which can be installed up to
300 feet (91.4m) from the evaporator unit. The unit-mounted control board also includes common alarm
terminals and shutdown terminals. The unit automatically restarts after a power outage.
Figure 4.1 Wall-box
4.4.1 Other Standard Control Features
• Adjustable auto restart
• 5 day/2 day setback
• Password protection
• Alarm enable/disable
• Self-diagnostics
• Calibrate sensors
• Predictive humidity control
• Common alarm output
• Remote shutdown terminals
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